<template>
  <div class="containers main-box">
    <a-button
      type="dashed"
      @click="zoomViewport(true)"><a-icon type="search" />放大</a-button>
    <a-button
      type="dashed"
      @click="zoomViewport(false)"><a-icon type="search" />缩小</a-button>
    <a-button
      type="dashed"
      @click="fitViewport"><a-icon type="search" />适中</a-button>
    <div class="canvas" ref="flowCanvas"></div>
  </div>
</template>
<script>
import { CustomViewer as BpmnViewer } from '@/components/customBpmn'

export default {
  name: 'FlowView',
  props: {
    xmlData: {
      type: Object,
      default: () => {}
    },
    taskList: {
      type: Array,
      default: () => []
    }
  },
  data () {
    return {
      bpmnViewer: null
    }
  },
  watch: {
    xmlData: function (val) {
      if (val) {
        this.getImg(val.xml)
      }
    }
  },
  mounted () {
    // 生成实例
    this.bpmnViewer && this.bpmnViewer.destroy()
    this.bpmnViewer = new BpmnViewer({
      container: this.$refs.flowCanvas,
      height: 'calc(100vh - 200px)'
    })
    this.getImg(this.xmlData.xml)
  },
  methods: {
    // 获取流程图片
    async getImg (xmlUrl) {
      const self = this
      try {
        await self.bpmnViewer.importXML(xmlUrl)
        self.fitViewport()
        if (self.taskList !== undefined && self.taskList.length > 0) {
          self.fillColor()
        }
      } catch (err) {
        console.error(err.message, err.warnings)
      }
    },
    // 设置高亮颜色的class
    setNodeColor (nodeCodes, colorClass, canvas) {
      for (let i = 0; i < nodeCodes.length; i++) {
        canvas.addMarker(nodeCodes[i], colorClass)
      }
    },
    // 让图能自适应屏幕
    fitViewport () {
      this.zoom = this.bpmnViewer.get('canvas').zoom('fit-viewport', 'auto')
    },
    // 放大缩小
    zoomViewport (zoomIn = true) {
      this.zoom = this.bpmnViewer.get('canvas').zoom()
      this.zoom += (zoomIn ? 0.1 : -0.1)
      if (this.zoom >= 0.2) this.bpmnViewer.get('canvas').zoom(this.zoom)
    },

    // 设置高亮颜色的
    fillColor () {
      const canvas = this.bpmnViewer.get('canvas')
      this.bpmnViewer.getDefinitions().rootElements[0].flowElements.forEach(n => {
        const completeTask = this.taskList.find(m => m.key === n.id)
        const todoTask = this.taskList.find(m => !m.completed)
        const endTask = this.taskList[this.taskList.length - 1]
        if (n.$type === 'bpmn:UserTask') {
          if (completeTask) {
            canvas.addMarker(n.id, completeTask.completed ? 'highlight' : 'highlight-todo')
            n.outgoing?.forEach(nn => {
              const targetTask = this.taskList.find(m => m.key === nn.targetRef.id)
              if (targetTask) {
                if (todoTask && completeTask.key === todoTask.key && !todoTask.completed) {
                  canvas.addMarker(nn.id, todoTask.completed ? 'highlight' : 'highlight-todo')
                  canvas.addMarker(nn.targetRef.id, todoTask.completed ? 'highlight' : 'highlight-todo')
                } else {
                  canvas.addMarker(nn.id, targetTask.completed ? 'highlight' : 'highlight-todo')
                  canvas.addMarker(nn.targetRef.id, targetTask.completed ? 'highlight' : 'highlight-todo')
                }
              }
            })
          }
        }
        // 排他网关
        else if (n.$type === 'bpmn:ExclusiveGateway') {
          if (completeTask) {
            canvas.addMarker(n.id, completeTask.completed ? 'highlight' : 'highlight-todo')
            n.outgoing?.forEach(nn => {
              const targetTask = this.taskList.find(m => m.key === nn.targetRef.id)
              if (targetTask) {
                canvas.addMarker(nn.id, targetTask.completed ? 'highlight' : 'highlight-todo')
                canvas.addMarker(nn.targetRef.id, targetTask.completed ? 'highlight' : 'highlight-todo')
              }
            })
          }
        }
        // 并行网关
        else if (n.$type === 'bpmn:ParallelGateway') {
          if (completeTask) {
            canvas.addMarker(n.id, completeTask.completed ? 'highlight' : 'highlight-todo')
            n.outgoing?.forEach(nn => {
              const targetTask = this.taskList.find(m => m.key === nn.targetRef.id)
              if (targetTask) {
                canvas.addMarker(nn.id, targetTask.completed ? 'highlight' : 'highlight-todo')
                canvas.addMarker(nn.targetRef.id, targetTask.completed ? 'highlight' : 'highlight-todo')
              }
            })
          }
        } else if (n.$type === 'bpmn:StartEvent') {
          n.outgoing.forEach(nn => {
            const completeTask = this.taskList.find(m => m.key === nn.targetRef.id)
            if (completeTask) {
              canvas.addMarker(nn.id, 'highlight')
              canvas.addMarker(n.id, 'highlight')
            }
          })
        } else if (n.$type === 'bpmn:EndEvent') {
          if (endTask.key === n.id && endTask.completed) {
            canvas.addMarker(n.id, 'highlight')
          }
        }
      })
    }
  }
}
</script>
<style lang="scss">
  @import "/node_modules/bpmn-js/dist/assets/diagram-js.css";
  @import "/node_modules/bpmn-js/dist/assets/bpmn-font/css/bpmn.css";
  @import "/node_modules/bpmn-js/dist/assets/bpmn-font/css/bpmn-codes.css";
  @import "/node_modules/bpmn-js/dist/assets/bpmn-font/css/bpmn-embedded.css";
  .bjs-powered-by {
    display: none;
  }
  .view-mode {
    .el-header, .el-aside, .djs-palette, .bjs-powered-by {
      display: none;
    }
    .el-loading-mask {
      background-color: initial;
    }
    .el-loading-spinner {
      display: none;
    }
  }
  .containers {
    // background-color: #ffffff;
    width: 100%;
    height: 100%;
    .canvas {
      width: 100%;
      height: 100%;
    }
    .panel {
      position: absolute;
      right: 0;
      top: 50px;
      width: 300px;
    }
    .load {
      margin-right: 10px;
    }
    .el-form-item__label{
      font-size: 13px;
    }

    .djs-palette{
      left: 0px!important;
      top: 0px;
      border-top: none;
    }

    .djs-container svg {
      min-height: 650px;
    }

    .highlight.djs-shape .djs-visual > :nth-child(1) {
      fill: green !important;
      stroke: green !important;
      fill-opacity: 0.2 !important;
    }
    .highlight.djs-shape .djs-visual > :nth-child(2) {
      fill: green !important;
    }
    .highlight.djs-shape .djs-visual > path {
      fill: green !important;
      fill-opacity: 0.2 !important;
      stroke: green !important;
    }
    .highlight.djs-connection > .djs-visual > path {
      stroke: green !important;
    }
    .highlight-todo.djs-connection > .djs-visual > path {
      stroke: orange !important;
      stroke-dasharray: 4px !important;
      fill-opacity: 0.2 !important;
    }
    .highlight-todo.djs-shape .djs-visual > :nth-child(1) {
      fill: orange !important;
      stroke: orange !important;
      stroke-dasharray: 4px !important;
      fill-opacity: 0.2 !important;
    }
    .overlays-div {
      font-size: 10px;
      color: red;
      width: 100px;
      top: -20px !important;
    }
  }
</style>
